Small Engines (Lawn Mowers, etc.): Craftsman Lawn Tractor will not start with new battery., craftsman lawn tractor, starter shaft

Question
Hello,
I had all the signs of a dead battery in the LT1100, instaled a new one, and now a 'Whirrrr' sound is all that occurs, no engine activity at all.  Starter bad?  Thanks

Answer
  not knowing  what engine  or your sound????   i,d give you this advise.  remove the cover off the top  of starter  where it engages flywheel when  key is turned.
if it is not spinning i,d say you need to try a starter  solinoid.   and then  possible starter.  maybe it just needs lube on starter shaft and gear  that engages into flywheel gear.  it must  move up and down  freely   and there needs to be a small spring on top of that  starter drive.   if your starter is fine,   battery is fine,  and everything else i mentioned is okay?  then i,d say  starter is shot.